Valdemar Poulsen - magnetic wire recording' inventor
Fritz Pfleumer - magnetic tape' inventor 
dr. Karl Daniel - inventator si promotorul casetei fara sfarsit/endless cassette inventor & promoter
J. Bardeen, W. Brattain, W.Shockley - transistor' inventors
William Powell Lear - 8-track cartridge inventor
Lodewijk/Lou F. Ottens - compact-cassette project coordinator 
Philips official annual catalogs 1962-2010
Panasonic, Technics official annual catalogs - 1966-2010
Allied electronics + Lafayette radio electronics = sample of distributors catalogs 1953-1974
Sony - official catalogs 1966-2008
sample of books relating audio domain
sample of relevant adverts (2) / exemple de reclame
1971 Exemplu de reclama pentru caseta / sample of advert for cassette (1)